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F = Ma
= 70 X 2.8
= 196 N
Kavungya answered the question on October 30, 2019 at 09:00
- The figure below shows a displacement time graph.
Describe the motion of the body between points:
OA
AB(Solved)
The figure below shows a displacement time graph.
![fig37301020191146.png](/questions/uploads/fig37301020191146.png)
Describe the motion of the body between points:
OA
AB
Date posted: October 30, 2019. Answers (1)
- The figure below shows a measuring cylinder which contains water initially at a level A.
A spherical solid is immersed in the water and the level...(Solved)
The figure below shows a measuring cylinder which contains water initially at a level A.
A spherical solid is immersed in the water and the level rises to B.
![fig35301020191141.png](/questions/uploads/fig35301020191141.png)
Determine the diameter of the spherical ball.
Date posted: October 30, 2019. Answers (1)
- Explain why a porridge in a cup wrapped with a wet cloth cools faster than when the cup is dipped in cold water.(Solved)
Explain why a porridge in a cup wrapped with a wet cloth cools faster than when the cup is dipped in cold water.
Date posted: October 28, 2019. Answers (1)
- i)Why should argon gas be at low pressure in a Geiger–Muller tube?
ii)State the purpose of the bromine gas in the tube.(Solved)
i)Why should argon gas be at low pressure in a Geiger–Muller tube?
ii)State the purpose of the bromine gas in the tube.
Date posted: October 17, 2019. Answers (1)
- Sodium has work function of 2.42eV. Calculate its threshold frequency.
(Take the plank’s constant to be 6.6 x 10-34 J)
(Solved)
Sodium has work function of 2.42eV. Calculate its threshold frequency.
(Take the plank’s constant to be 6.6 x 10-34 J)
Date posted: October 17, 2019. Answers (1)
- i)Sketch on the axis below a graph of the e.m.f generated against the angle as the coil rotates from 00 to 900 and from 900...(Solved)
i)Sketch on the axis below a graph of the e.m.f generated against the angle as the coil rotates from 00 to 900 and from 900 to 1800.
![fig42171020191419.png](/questions/uploads/fig42171020191419.png)
ii)Give reasons for the changes in the e.m.f as the coil rotates from 00 to 1800.
Date posted: October 17, 2019. Answers (1)
- How is flux leakage minimized?(Solved)
How is flux leakage minimized?
Date posted: October 17, 2019. Answers (1)
- Define flux leakage as used in transformers.(Solved)
Define flux leakage as used in transformers.
Date posted: October 17, 2019. Answers (1)
- The diagram below is a circuit with 2 bulbs and components D.
State and explain which of the lamps L1 and L2 would light when the...(Solved)
The diagram below is a circuit with 2 bulbs and components D.
![fig41171020191410.png](/questions/uploads/fig41171020191410.png)
State and explain which of the lamps L1 and L2 would light when the switch is closed.
Date posted: October 17, 2019. Answers (1)
- A tube of length 36cm is closed at one end. It is at resonance with a turning fork of frequency 256Hz sounded above the open...(Solved)
A tube of length 36cm is closed at one end. It is at resonance with a turning fork of frequency 256Hz sounded above the open end. Given that the velocity of sound in air is 334m/s.
Determine:
i)The wavelength of the wave generated by the turning fork.
ii)The end correction of the tube.
Date posted: October 17, 2019. Answers (1)
- State two conditions necessary for production of constructive interference. (Solved)
State two conditions necessary for production of constructive interference.
Date posted: October 17, 2019. Answers (1)
- The figure below shows plane waves in a ripple tank. The water is deeper in section A and C then in section B.
Draw the waves...(Solved)
The figure below shows plane waves in a ripple tank. The water is deeper in section A and C then in section B.
![fig38171020191358.png](/questions/uploads/fig38171020191358.png)
Draw the waves after passing section B.
Date posted: October 17, 2019. Answers (1)
- A student set up a circuit using three identical bulbs A,B and C each rated at 6V, 1.0A as shown below
i)Determine the resistance of one...(Solved)
A student set up a circuit using three identical bulbs A,B and C each rated at 6V, 1.0A as shown below
![fig35171020191354.png](/questions/uploads/fig35171020191354.png)
i)Determine the resistance of one of the bulbs when operating normally.
ii)Calculate the effective resistance of the three bulbs.
iii)Draw a circuit diagram showing the three bulbs A, B and C connected in such a way that they would all light at normal brightness.
Date posted: October 17, 2019. Answers (1)
- State the type of electromagnetic spectrum emitted by warm objects.(Solved)
State the type of electromagnetic spectrum emitted by warm objects.
Date posted: October 17, 2019. Answers (1)
- The figure below shows a ray of light travelling through water, whose refractive index is 1.33.
Determine the refractive index of glass. (Solved)
The figure below shows a ray of light travelling through water, whose refractive index is 1.33.
![fig33171020191347.png](/questions/uploads/fig33171020191347.png)
Determine the refractive index of glass.
Date posted: October 17, 2019. Answers (1)
- The graphs in the figure below represent the same wave.
Determine the velocity of the wave.(Solved)
The graphs in the figure below represent the same wave.
![fig31171020191343.png](/questions/uploads/fig31171020191343.png)
Determine the velocity of the wave.
Date posted: October 17, 2019. Answers (1)
- The figure below shows the path of a ray of light after striking two mirrors XY and YZ at an angle.
Determine the angle between the...(Solved)
The figure below shows the path of a ray of light after striking two mirrors XY and YZ at an angle.
![fig30171020191340.png](/questions/uploads/fig30171020191340.png)
Determine the angle between the two mirrors
Date posted: October 17, 2019. Answers (1)
- An object 10cm high is placed 30cm in front of a concave mirror. The image is 45cm in front of the mirror. Find its magnification...(Solved)
An object 10cm high is placed 30cm in front of a concave mirror. The image is 45cm in front of the mirror. Find its magnification and size of the image.
Date posted: October 17, 2019. Answers (1)
- In an attempt to make a magnet, a student used the double stroke method as shown below.
State the polarities at the ends A and B(Solved)
In an attempt to make a magnet, a student used the double stroke method as shown below.
![fig28171020191335.png](/questions/uploads/fig28171020191335.png)
State the polarities at the ends A and B
Date posted: October 17, 2019. Answers (1)
- The figure below shows a metallic sphere (A) suspended by a cotton thread. A negatively charged rod (B) is brought near the sphere. Explain other...(Solved)
The figure below shows a metallic sphere (A) suspended by a cotton thread. A negatively charged rod (B) is brought near the sphere. Explain other three steps for charging sphere A positive.
![fig27171020191332.png](/questions/uploads/fig27171020191332.png)
Date posted: October 17, 2019. Answers (1)